They either are extremely privacy and freedom oriented and chose Epik with a false belief that they would uphold their privacy and freedom of speech.

Or they run websites that contain content that would get them removed from most mainstream platforms, and likely would earn them an unforgiving response here should they share those sites.

I am inclined to believe it is the latter, as that is literally the selling point of Epik's services: That your violent or extremist rhetoric won't get your terminated from the service.